Heterogeneous catalyst and method for deep treatment of refractory wastewater

A heterogeneous catalyst and advanced treatment technology, which is applied in molecular sieve catalysts, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of high cost and complicated process, and achieve long life, high reactivity, and pH adaptation broad effect

Inactive Publication Date: 2018-09-25
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction system still needs a large amount of acid to adjust the pH value of the wastewater, the process is complicated and the cost is high

Method used

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  • Heterogeneous catalyst and method for deep treatment of refractory wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0021] Weigh quantitative Al with electronic balance 2 o 3 Carrier and adding an appropriate amount of deionized water for saturated adsorption, determine the Al 2 o 3 Carrier saturated water absorption. Accurately weigh the active component precursor Fe(NO 3 ) 3 9H 2 O and cocatalyst precursor MnSO 4 ·H 2 O is configured into an aqueous solution, and the corresponding mass of the carrier Al will be weighed 2 o 3 Slowly add to the soaking liquid and stir until homogeneous. Immerse it in a water bath at 30°C for 12 hours, then dry it in an oven at 60°C for 12 hours; finally put it in a muffle furnace and bake it at 450°C for 5 hours to obtain a Fe loading of 15% and a cocatalyst loading of 1%. catalyst.

[0022] The initial CODcr of oil production wastewater after biochemical treatment is 198mg / L, pH is 8, catalyst concentration is 2.5g / L, H 2 o 2 The concentration of CODcr was 5.1g / L, and the CODcr was reduced to 42mg / L at a temperature of 70°C for 2h.

Embodiment example 2

[0024] Accurately weigh the active component precursor Fe according to the load 2 (SO 4 ) 3 and cocatalyst precursor Ce(NO 3 ) 4 Configured as an aqueous solution, weigh the corresponding mass of the carrier Al 2 o 3Slowly add to the soaking liquid and stir until homogeneous. Immerse it in a water bath at 30°C for 12h, then dry it in an oven at 60°C for 10h, and finally put it into a muffle furnace and bake it at 650°C for 5h to obtain a Fe loading of 10% and a cocatalyst loading of 0.5%. catalyst.

[0025] The initial pH value of secondary treatment wastewater in paper mills is 8.5, the CODcr is about 400mg / L, and the Cl - The concentration is 200mg / L, SO 4 2- It is 300mg / L, and the absorbance at 400nm is 0.482. When the reaction temperature is 70°C, the amount of catalyst added is 2.5g / L, H 2 o 2 The dosage is 3.0g / L, the reaction time is 90min, the CODcr removal rate reaches 86.2%, and the decolorization rate reaches over 98.6%.

Embodiment example 3

[0027] Accurately weigh the active component precursor FeCl3 and the co-catalyst precursor CuSO according to the load 4 ·5H 2 O is configured as an aqueous solution, and the corresponding mass of carrier commercial activated carbon is slowly added to the impregnation solution and stirred until uniform. Immerse it in a water bath at 30°C for 10h, then dry it in an oven at 60°C for 10h; finally put it into a muffle furnace and bake it at 400°C for 4h.

[0028] 1000mg / L acid scarlet-3R dye wastewater, pH value is 11.8, at reaction temperature 60℃, H 2 o 2 The dosage is 9.4g / L, and the mass concentration of the catalyst is 1.5g / L. The degradation rate of acid scarlet dye wastewater was 99%, and the removal rate of CODcr was 83%.

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Abstract

The invention discloses preparation of a heterogeneous catalyst and a method for catalyzing the H2O2 deep oxidation of refractory wastewater by using the same. The heterogeneous catalyst uses nanometer alpha-Fe2O3 as an active component which is uniformly loaded on a porous carrier; and under the synergistic action of a cocatalyst, the heterogeneous catalyst can catalyze H2O2 oxidation of refractory wastewater in a pH value range of 3-10. The heterogeneous catalyst of the invention overcomes the disadvantages that traditional Fenton reagent reaction systems needs acidic conditions for reaction, catalyst cannot be reused and iron-containing sludge is produced in the prior art. The catalyst can maintain high activity in a wide range of acidic, neutral, and weakly alkaline pH ranges, and haslong service life, reusability and no secondary pollution.

Description

technical field [0001] The present invention relates to the preparation of a kind of heterogeneous catalyst and utilization thereof to catalyze H 2 o 2 A method for deep oxidation of refractory wastewater. Background technique [0002] With the continuous development of my country's economy, the rapid development of industry and agriculture and the continuous improvement of human living standards, the demand for water in agricultural production, industrial production and human life is also increasing. The resulting large amount of refractory wastewater has caused serious threats and damage to human life and the earth's ecosystem. [0003] Traditional treatment technologies for refractory wastewater include physical, chemical and biological methods. Among them, physical methods include incineration, extraction, steam, adsorption, etc.; chemical methods include chemical precipitation, ultraviolet oxidation, electrochemical oxidation, etc.; biological methods include activat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/83B01J23/889B01J29/46C02F1/72
CPCC02F1/722C02F1/725B01J23/745B01J23/83B01J23/8892B01J29/46
Inventor 吕树祥郭二亮李家庆姚月胡振吴迪
Owner TIANJIN UNIV OF SCI & TECH
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